TC-508 Service Manual
20
28 VSS_CLD GND S Ground power supply for digital PA
29 CLD_OUTM Reserve O Negative output of digital PA
30 Vdd_CLD
VCC（3.0V）
S Power supply for digital PA
31 P77 Reserve O Reserved
32 P76/DAC1 APC/TU DA TX power control/RX bandpass control
33 P75/VREF VCC(3.0V) I Input pin of reference voltage of ADC and DAC
34 P74/DAC0 QT_OUT DA CTCSS/CDCSS output
35 P73/AD3 VOX AD VOX energy detection pin
36 Vssa GND S Ground power supply for analog circuit
37 Vdda
VCC（3.0V）
S Power supply for analog circuit
38 P72/AD2 Reserve AD Reserved
39 P71/AD1 SQL AD Detect noise
40 P70/AD0 BAT_DET AD Detect battery strength
41 XTAL0 OSC0 For 32.678KHz main crystal oscillator
42 XTAL1 OSC1
43 PLL_CAP PLL_CAP For PLL external capacitor (10nF)
44 NC / / /
45 NC / / /
46 NC / / /
47 NC / / /
48 NC / / /
49 P03/COM3 VOICE_DATA O Audio IC data pin
50 P02/COM2 VOICE_BUSY I Audio IC feedback pin
51 P01/COM1 VOICE_CLK O Audio IC clock pin
52 P00/COM0 VOICE_RESET O Audio IC reset pin
53 P10/SEG0 Reserve O Reserved
54 P11/SEG1 Reserve O Reserved
55 P12/SEG2 RX_MUTE O Control of RX circuit (H: On)
56 P13/SEG3 LD I PLL Unlock Detection
(H: Lock; L: unlock)
57 P14/SEG4 Reserve O Reserved
58 P15/SEG5 Reserve O Reserved
59 P16/SEG6 Reserve O Reserved
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